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1、整理课件gas (气体气体)liquid (液体液体)solid (固体固体)travel (传播传播)Lesson 2 Where Can Sound Travel?整理课件Can sound travel in space?I cant hear you.We must go to the space station.整理课件Pluck an elastic band. Can you hear the sound? If you are in space, can you hear the sound? Why?Sound ( can / cannot ) travel through

2、air.There is no air in space. Sound ( can / cannot ) travel in space.整理课件Can sound travel through a solid? string fork整理课件Tie a loop in one end of the string. Tie the other end to a fork.Put the loop over your finger. Then put your finger into your ear. Let your friend tap the fork.12整理课件I (can / ca

3、nnot) hear the sound of the fork.Sound (can / cannot) travel through solids.整理课件Can sound travel through a liquid? water plastic bagradio整理课件Put a radio in a plastic bag.Seal the bag.Put the bag under water. Turn on the radio through the bag.12整理课件I (can / cannot) hear the sound of the radio.Sound (can / cannot) travel through water.整理课件Sound can travel through solids, liquids and gases.Sound cannot travel in space.整理课件I made sounds.I did experiments.I measured sounds.整理课件Make “string telephones”. Talk to a friend. Can you hear each other? How does the sound travel?整理课件整理课件Wha

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